详解Springboot 注入装配到IOC容器方式

2024-04-02 19:04:59 252人浏览安东尼

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摘要

1、通过bean注解装配到ioc容器创建装配的类，如下 package com.sboot.pr.bean; p

1、通过bean注解装配到ioc容器

创建装配的类，如下


package com.sboot.pr.bean;

public class BeanPOJO {
 
	private int id;
	
	private String name;
	
	private int age;
 
	public int getId() {
		return id;
	}
 
	public void setId(int id) {
		this.id = id;
	}
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public int getAge() {
		return age;
	}
 
	public void setAge(int age) {
		this.age = age;
	}
	
	
}

通过bean注解装配BeanPOJO到ioC容器


package com.sboot.pr.config;
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
import com.sboot.pr.bean.BeanPOJO;
 
 

@Configuration
public class BeanConfig {
 
	
	@Bean(name = "beanPOJO")
	public BeanPOJO initBeanPOJO() {
		BeanPOJO pojo = new BeanPOJO();
		pojo.setId(1);
		pojo.setName("BeanPOJO");
		pojo.setAge(29);
		return pojo;
	}
}

把装配的BeanPOJO 注入


package com.sboot.pr.controller;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.WEB.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import com.sboot.pr.bean.BeanPOJO;
import com.sboot.pr.bean.ComponentPOJO;
import com.sboot.pr.bean.ComponentScanPOJO;
 
 

@RestController
public class TestController {
	
	@Autowired
	private BeanPOJO beanPoJO;
 
	
	@GetMapping("/boot/getBeanPOJO")
	public BeanPOJO getBeanPOJO() {
		return beanPoJO;
	}
}

访问注入的BeanPOJO信息

Http://localhost:1111/boot/getBeanPOJO

2、通过Component注解扫描装配bean到IOC容器

创建装配的类，如下


package com.sboot.pr.bean;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;
 

@Component("componentPOJO")
public class ComponentPOJO {
 
	@Value("2")
	private int id;
	
	@Value("ComponentPOJO")
	private String name;
	
	@Value("29")
	private int age;
 
	public int getId() {
		return id;
	}
 
	public void setId(int id) {
		this.id = id;
	}
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public int getAge() {
		return age;
	}
 
	public void setAge(int age) {
		this.age = age;
	}
	
	
}

把装配的ComponentPOJO 注入


package com.sboot.pr.controller;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import com.sboot.pr.bean.BeanPOJO;
import com.sboot.pr.bean.ComponentPOJO;
import com.sboot.pr.bean.ComponentScanPOJO;
 
 

@RestController
public class TestController {
	
	
	@Autowired
	private ComponentPOJO componentPOJO;
 
    
	@GetMapping("/boot/getComponentPOJO")
	public ComponentPOJO getComponentPOJO() {
		return componentPOJO;
	}
 
}

访问注入的ComponentPOJO 信息

http://localhost:1111/boot/getComponentPOJO

3、通过ComponentScan注解扫描装配bean到IOC容器

创建装配的类，如下


package com.sboot.pr.bean;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 

@Configuration
@ComponentScan
public class ComponentScanPOJO {
 
	@Value("3")
	private int id;
	
	@Value("ComponentScanPOJO")
	private String name;
	
	@Value("29")
	private int age;
 
	public int getId() {
		return id;
	}
 
	public void setId(int id) {
		this.id = id;
	}
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public int getAge() {
		return age;
	}
 
	public void setAge(int age) {
		this.age = age;
	}
	
	
}

把装配的ComponentScanPOJO 注入


package com.sboot.pr.controller;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import com.sboot.pr.bean.BeanPOJO;
import com.sboot.pr.bean.ComponentPOJO;
import com.sboot.pr.bean.ComponentScanPOJO;
 
 

@RestController
public class TestController {
	
 
	@Autowired
	private ComponentScanPOJO componentScanPOJO;
 
	
	@GetMapping("/boot/getComponentScanPOJO")
	public ComponentScanPOJO getComponentScanPOJO() {
		return componentScanPOJO;
	}
	
	
}

访问注入的ComponentScanPOJO信息

http://localhost:1111/boot/getComponentScanPOJO